Find the mean of the first seven natural numbers.
- A$14$
- B$4$
- C$10$
- D$12$
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Similar Questions
The mean of the $10$ observations is $11$. If one new observation is included,their mean becomes $12$. The included new observation is ........
Easy
View SolutionDraw a histogram for the following frequency distribution with unequal class length:
Class $0-10$ $10-20$ $20-40$ $40-70$ $70-100$ Frequency $15$ $13$ $28$ $36$ $27$
| Class | $0-10$ | $10-20$ | $20-40$ | $40-70$ | $70-100$ |
| Frequency | $15$ | $13$ | $28$ | $36$ | $27$ |
Medium
View SolutionThe mean of the following distribution is $50$. Find the value of $a$ and hence the frequencies of $30$ and $70$.
$x$ $f$ $10$ $17$ $30$ $5a+3$ $50$ $32$ $70$ $7a-11$ $90$ $19$
| $x$ | $f$ |
| $10$ | $17$ |
| $30$ | $5a+3$ |
| $50$ | $32$ |
| $70$ | $7a-11$ |
| $90$ | $19$ |
Difficult
View SolutionThe following observations are arranged in ascending order:
$26, 29, 42, 53, x, x+2, 70, 75, 82, 93$
If the median is $65,$ find the value of $x$.
$26, 29, 42, 53, x, x+2, 70, 75, 82, 93$
If the median is $65,$ find the value of $x$.
Medium
View SolutionThe class mark of a frequency distribution with equal sizes of two successive classes is $72$ and $77$. Then,the width of the class is ...........
Easy
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